Is there anyway to trickle charge a spare battery through a cigarette
lighter (while the truck is running of course)? I could get a lighter
outlet adapter and then just connect to the battery (making sure that the +
and - are correct).
Im just concerned that i might either blow the fuses or turn the cable into
a toaster coil.
The concept seems possible, seeing that there is a charge wire in the towing
harness for campers, but is there any other hardware required? Just a
hookup to the spare battery?
I got one of eBay for a Volkswagen. It works just like you describe, the
only things you have to watch for is don't use it when the engine is running
(DUH!) and make sure the cig. lighter works with the ignition off.
For the most part, I don't think it generates enough charge to damage the
internal wires of the vehicle.
RJ in WV
I should note that I understood the question to be different from the
rest of you. Sounds like the OP is asking about charging an extra
battery, in the passenger compartment, using power provided by the
cig. lighter. I may be wrong, and will shove a foot in my mouth if so
(virtually of course), but that's what I read.
On that note, I'm pretty sure the emergency, self-contained jump-start
units will charge off the cig lighter. Some units will also reverse
the flow of electricity and re-charge the car battery if needed,
enough to start the car, others will attach to the battery like
jump-starting from another vehicle...
I AM looking to charge a spare battery in the passenger compartment...Iv
already got dual batterys under the hood but dont want to drain them down
with the cooler (see below)
I bought one of those electric coolers and it runs off 12v outlet from the
vehicle. i also have a spare battery i bought a while ago just sitting
idle. what i was hoping to do was use the battery while im camping at night
to keep the cooler running and when i start driving around, charge that
battery (while the cooler is hooked into another cig lighter). I wasnt too
keen on keeping it plugged into the vehicle overnight because it draws about
5amps. it will kill a battery in about 6-8 hours. im also in the process
of locating a battery cutoff (stops the flow of power when the voltage drops
to <10 volts) I think bass pro shops sells one.
Im not a smoker...but ill keep the windows cracked to let out the potential
For running a cooler overnight you'd be better off buying or scrounging a
deep cycle marine battery or a deep cycle caravan battery that is designed
for that sort of use. A normal car/truck battery is designed to provide tons
of power for a short period to crank the starter. and then filter the
alternator power, Not to sustain a small draw for long periods.
Yes you would turn the cable into a toaster, or pop a fuse.
You need: Some way to limit the current into the battery, a blocking diode, and
matched wire AWG
Easist way would be to set up the battery with wires that match the existing AWG
of the wires to the
battery and install a battery isolator.
i guess it depends on what the spare battery is for and how often it's
i think you're looking for trouble trying to charge it from the cig
however, if it's say a spare battery that you carry in the back of the
pickup for jump starts or something, you could use a cheap power
inverter and a 110v trickle charger..
i have a solar charger on my trailer battery... keeps it from going
down when the trailer is in storage... you might try that way, also,
it was like $30 at harbor freight...
Connect a stoplight bulb in series between the batteries. Tis will
limit the current in order to prevent tdamage to the wiring, yet allow
plenty to flow into the second battery, to charge it. The cold
resistance of the bulb (1156), is very low.
Colorado Springs, CO
My advice may be worth what you paid for it.
The usual way to charge a second battery is through a relay sold as a "battery
isolator" by RV supply stores and parts houses. It connects the second battery
when the alternator is charging, disconnects it otherwise so you don't drain both
of your batteries. There are solid state versions as well a cheap relay version.
You can leave the second battery connected to the charging circuit without worry
that you will drain your engine battery. A low (drained) secondary battery will
want to take more amps than a bulb will allow without blowing the bulb filament,
assuming you are talking about a deep cycle type RV battery. If its a small
equipment battery for lantern, metal detector, etc. then it might work.
Dan Dunphy wrote:
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